EASY
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By the addition of which compound does the solubility of iodine in water increase?
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Important Questions on Theoretical Principles of Experimental Chemistry
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A white precipitate was formed when was added to water extract of an inorganic salt. Further, a gas with characteristic odour was released when the formed white precipitate was dissolved in dilute HCI. The anion present in the inorganic salt is:
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In the detection of II group acid radical, the salt containing chloride is treated with concentrated sulphuric acid, the colourless gas is liberated. The name of the gas is
MEDIUM
Match List I with List II.
| List-I (Anion) |
List-II (gas evolved on reaction with dil. ) |
||
| (A) | (I) |
Colourless gas which turns lead acetate paper black. |
|
| (B) | (II) |
Colourless gas which turns acidified potassium dichromate solution green. |
|
| (C) | (III) | Brown fumes which turns acidified KI solution containing starch blue. | |
| (D) | (IV) | Colourless gas evolved with brisk effervescence, which turns lime water milky. |
Choose the correct answer from the options given below
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and both when dissolved in water containing ions the pair of species formed is:
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On heating, lead (ll) nitrate gives a brown gas (A). The gas (A) on cooling changes to a colourless solid/liquid (B). (B) on heating with NO changes to ablue solid (C). The oxidation number of nitrogen in solid (C) is:
MEDIUM
A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the before mentioned solution, a white precipitate is obtained which does not dissolve in dilute nitric acid. The anion is:
MEDIUM
Which combines with to form brown complex?
MEDIUM
The sodium salt of an organic acid produces effervescence with concentrated . reacts with the acidified aqueous solution to give a white precipitate which decolourises acidic solution of . is
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Reaction of an inorganic sulphite with dilute generated compound . Reaction of with gives . Further, the reaction of with and water affords compound and , respectively, are :
MEDIUM
Sodium nitroprusside, when added to an alkaline solution of sulphide ions, produce a
HARD
When a mixture of and concentrated is heated in a dry test tube, a red vapour is evolved. This vapour turns an aqueous solution of yellow due to the formation of and respectively, are:
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The reagent(s) that can selectively precipitate from a mixture of and in aqueous solution is (are)
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When treated with conc. yields gas which further reacts with to generate a white solid reacts with dil. to produce the same gas the solid is
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The blue colour produced when a starch solution is added to a solution containing traces of is due to
(I) formation of
(II) formation of an inclusion complex
(III) Oxidation of starch
(IV) Oxidation of
MEDIUM
Working with a partner, discuss what you would see in a test tube in which concentrated sulfuric acid is added drop-wise to solid potassium iodide that you would not see if the acid was added to potassium chloride.
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Copy and complete the equation below, including state symbols.
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When layer containing both and is shaken with excess of water, the violet colour due to disappears and orange colour due to appears. The disappearance of violet colour is due to the formation of
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Starch-iodide paper is used to test the presence of-
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When layer containing both and is shaken with excess of water, the violet colour due to disappears and a pale yellow colour appears in the solution. The disappearance of violet colour and appearance of pale yellow colour is due to the formation of :
EASY
Mix of conc. , when heated in a test tube dark vapours evolve is_____. (write name)
